Prelate.Zeratul's Ultimate: Chronosphere decreases time in a radius by 1000%. Essentially, as seen ingame, all heroes (except the casting Zeratul, as he's immune) will slow down precisely 10x. Their movement, weapon speed, regen, cooldowns and buffs/debuffs/channelled abilities will all slow down immensely.

Shadow.Geminus' Ultimate: Shadow Walk increases Shadow's Time by 60% in a radius of 7/10/13. Again, Shadow will speed up to 1.6x his normal movement speed and weapon speed, and his regen, cooldowns, and buffs/debuffs will speed up in function as well.